Flashback: Steve Jobs and Pixar — How It Started

Steven P. Jobs, the visionary co-founder of Apple who helped usher in the era of personal computers and then led a cultural transformation in the way music, movies and mobile communications were experienced in the digital age, died Wednesday. He was 56.

The death was announced by Apple, the company Mr. Jobs and his high school friend Stephen Wozniak started in 1976 in a suburban California garage.

A friend of the family said that Mr. Jobs died of complications from pancreatic cancer, with which he waged a long and public struggle, remaining the face of the company even as he underwent treatment. He continued to introduce new products for a global market in his trademark blue jeans even as he grew gaunt and frail.

He underwent surgery in 2004, received a liver transplant in 2009 and took three medical leaves of absence as Apple’s chief executive before stepping down in August and turning over the helm to Timothy D. Cook, the chief operating officer. When he left, he was still engaged in the company’s affairs, negotiating with another Silicon Valley executive only weeks earlier.

“I have always said that if there ever came a day when I could no longer meet my duties and expectations as Apple’s C.E.O., I would be the first to let you know,” Mr. Jobs said in a letter released by the company. “Unfortunately, that day has come.”